Rotary pump.



` P. J. CURTIS.

ROTARY PUMP. APPLIOATION FILED APR. 1o, 1909.

' Patented Aug. 8, 1911.

3 SHEETS-SHEET 2.

WITNESSES: l I fff/ndf F. J. CURTIS.

ROTARY PUMP.

APPLICATION FILED APR. 1o, 1909.

Patented Aug. 8, 1911.

a SHEETS-SHEET 3.

INN E NTCFE WITNESSES;

i rTn-n sTATns PATENT oFFTcE.

ROTARY PUMP.

Specification of Letters Patent.

Patented Ang.j8, 1911.

AApplication led April 10, 1909. Serial No. 489,114.

ments the following .is a specilication.

In an application filed November 12, 1908, Serial No. 462,304, I have described and claimed certain improvements in rotary pumps, including a construction whereby the blades or vanes are moved outwardly to bear against the periphery of the cylinder by a pressure proportional to the height of the discharge column from the pump, when the pocket immediately in fronts of a given blade is subjected to discharge pressure.

The invention described herein relates to certain further additional improvements whereby each blade will be subjected to a pressure forcing it. outward, so as to bear` againstthe inner periphery of the cylinder, proportional to the height of the discharge column, such pressure becoming effective `against the blade or vane after passing the inlet port. It is a further object of the invention to provide for a balancing of pressures operative against the vanes in the-direction of rotation. The invention is hereinafter more fully described and claimed.

In the accompanying drawings forming a part of this specification, Figure 1 is a sectional elevation of my improved pump; Fig. 2` is a transverse section on a plane indicated by the line II-II Fig. 1, and Fig. 3

' is a side elevation with one of the side plates removed and, the rotary member with its blades indicated in ldotted lines.

In the practice of my invention the pump is formed by a drum 1- provided at one point with an inlet opening or nozzle 2 and at another point with a discharge nozzle 3, and having removable heads 4, closing the ends lof the drum and provided with bearings 5 for the shaft of the rotary member, said bearings being eccentric to the drum. The rotary member 14 is provided with radial sockets 15 for the reception of the blades or vanes, which consist preferably of outer portionspl formed of suitable material as vulcanized rubber or hard wood", preferbly the former, as by reason of its density and non-fibrous character its surfaces can be made very smooth and will therefore be very durable, ontlasting any other materials heretoforeemployed. And further the vulcanized rubber blades will not change in shape or dimensions or become softened by absorption 'of water, as do blades made of the densest woods, which when the pumps are employed in mines, should be of a character capable of resisting the action of acid contained in such water. As stated in the application referred to the blades or vanes, when passing across the outlet port, are subjected to a pressure tending to force them inwardly, proportional to thevheight of the liquid column inthe discharge passage. Such inward movement is prevented in the construction described and shown in the application referred to by forming ports or passages extending from points onthe periphery of the rotary member in front of the blades or vanes to the inner ends of the sockets 15, s0 that the inner ends of the blades are subjected to outwardly acting pressure and there will be no tendency whatsoever for an inward movement of the blades as soon asta pocket is open to discharge pressure. As thus constructed the blades or vanes will be subjected to the disch arge pressure only when the blade or vane forming the front wall of a pocket passes beyond the first edge of the discharge port, so that the pressure ir! the discharge will act on the water in such pocket and the pressure will be transmitted through the port i or passageY to vthe socket 15 in t e next succeeding blade forming the rear of the water pocket.

It has been found that the centrifugal action will not always be suiicient to hold the blade or vane in contact with the inner periphery of the cylinder, after it has passed the inlet port and before the pocket 1n advance of any one blade is in connection with the discharge passage.- In order to insure a firm bearing of the blades as they pass beyond the inlet port, a connect1on is formed from the discharge opening to each socket '15 in the rear of the bladel or vane therein, as such blade passes'the inlet port. Such connection is conveniently made by a passage 21 preferably extending along each endofI the cylinder to a point where they will register with the ends of the sockets 15, which, as shown in Fig. 2, extend entirely along the rotary member, just as the blade carried by such socket passes the rear edge a of the inlet port. Where the end' of the cylinder proper is formed by a removable plate 22 as in the construction shown, this passage 21 is conveniently formed by slottingr the plate or'plates, as shown in Figs. 1, 2 and 3. It is preferred that the passage should be so constructed and arranged as to be in register with the ends of the sockets| 15 when the blades or vanes pass beyond the edge a, of the inlet port, to continue in register With the sockets at least until after the blades or'vanes have reached such a position Where it has been pushed back into the socket by the Wall of the cylinder.

I claim herein as my invention:

1. In a rotary pump, the combination of a cylinder having inlet and outlet ports, a rotary member eecentrically mounted in the cylinder' and provided with radial sockets, vanes mounted in the sockets, means for applying fluid pressure acting to lforce the vanos outwardly during their passage from a point beyond the inlet port to a point beyond the outlet port, and means forrelieving such pressure upon the vanes While passing the inlet port.

2. In a rotary pump, the combination ofl a cylinder having inlet andvoutlet ports, a

from a point beyond the inlet port to a point beyond the outlet port, and means for relieving such pressure upon the vanes While passing the inlet port.

3. In a rotary pump, the combination of a cylinder, a rotary member eccentrically mounted therein and blades or vanes movably mounted in the rot-ary member and formed of a non-metallic non-porous matcrial.

4. In a rotary pump, the combination of a cylinder, a rotary member eccentrically mounted therein, and blades or vanes` formed of vulcanized rubber movably mounted in the rotary member.

In testimony whereof, I have hereunto set my hand.

` .FRANK J. CURTIS. Witnesses:

CHARLES BARNETT, FRANCIS J. ToMAssoN. 

